Safety-valve.



Patented Sept. 4, |900. J. M. CUALE.

SAFETY VALVE.

(Application led Inn. 12, 1900.)

-2 Sheets-Sham4 l.

(No Model.)

.n IA l Jimi..

` Patented Sept. 4, |900. J. M. COALE..

SAFETY VALVE.

(Application med Jan. 12, 1900.)

(No Model.)

31a/vanto@ UNITED STATES PATENT OFFICE.

JOSEPH M. COALE, OF BALTIMORE, MARYLAND.

SAFETY-VA LV.

SPECIFICATION forming part of Letters Patent No. 657,086, dated September 4, 1900. Application filed January 12, 1900. Serial No. 1,239. (No model.)

To ctZZ whom, it may concern:

Be it known that I, JOSEPH M. COALE, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Safety-Valves and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to safetyvalves, and especially to those known as pop-valves, being an improvement upon the invention shown in my former patent, No. l=59,l0et,dated September 6, 1891. In that patent is disclosed a pressure regulating ring which screws up and down on the outside of the valve-seat to vary the annular opening between said ring and the outer edge of the pop-chamber in order to vary the amount'of reduction in steam-pressure which will take place when the valve blows. It is found in practice that screw-threaded rings, whether adjustable by the means shown in my aforesaid patent or in other ways, are liable to.

stick when allowed to remain untouched for some time. This makes it hard to move them and renders nice adjustment a matter of considerable diflculty. My present invention aims -to overcome this trouble; and to that end it consists in a ring forming one wall of the pop-chamber made in two or more parts, one or more of which is or are movable radially with respect to the valve-stem or valveseat, in distinction from a ring movable lengthwise or parallel therewith, as in my aforesaid patent. The divided or sectional ring is seated upon an annular shoulder or bed formed in the valve-casing and of suficiently-larger diameter than the ring to allow it room to be moved in and out. The adj ustment of the ring-sections is effected, preferably, by a screw tapped through the wall of the valve-casing, so that the adjusting can be done from the outside.

In the accompanying drawings, Figure lis a vertical diametrical section of a muffled safety-valve embodying my invention. Fig.

2 is a plan view of the sectional ring, partly in section and partly broken away. Fig. 3 is a side elevation of the same. Fig. t is a diametrical section thereof. Fig. 5 is an elevation of the rib containing the socket for the head of the adjusting-screw; and Fig. 6 is a modification of the ring, showing both sections 'capable of adjustment, the last four views being on an enlarged scale.

The lower section A of the valve-casing is provided, as usual, with the screw-threads a for attaching it to a steam-pipe, the guide a' for the valvefstem, the annular beveled or countersunk valve-seat a2, the annular well aconcentric with and surrounding said seat, and the screw-threaded tubular part a4 for the reception of the screw-threaded neck b of the upper sectionB of the valve-casing. The valve C has a central stem c, received in the guide a', au annular` beveled face c to iit the seat a2, and a projecting iange c2, slightly undercut and having a beveled edge cs and forming the inner side and top of the popchamber. The valve is held to its seat by the spring D, as usual. The outer Wall of the pop-chamber and also a portion of its bottom are formed by the pressure -regulating ring, which rests on the bottom of the well as and is prevented from rising by the lower end of the neck b, which lies just above and touching said ring. The well c3, however, is wider radially than the ring, so that the latter can move in and out therein. To permit this, the ring is made in two or more sections, one or more of which can be moved radially by suitable means. In the drawings the rings are shown in halves E E', which for the sake of lightness are preferably made rather thin, as shown, with upright external ribs at certain points. Thus the meeting ends of the sections are preferably provided with ribs e, one of which may carry a tangential pin c', passing freely through a hole in the other to keep the two parts in line. Any other equivalent means for doing this maybe used.

At a point midway between the ends of one of the ring-sections is a rib e2 for the attachment of the adjusting device. For this I prefer to use a screw F, tapped through the valve-casin g and provided with a lock-nut F,

IOO

The inner end of the screw is provided with a4 head f,which is received in a socket e3 in the rib e2, the socket being open at the bottom to enable it to be readily engaged with the head f when the ring is dropped into the well a3 in the casing. The cross-section of the socket shows a keyhole shape, which causes the ring-section to move with the screw when it is backed out or lscrewed in.

' In Figs. l, 2, 3, and 4 only one halt` the ring is arranged to be adjusted, the other half E being held fast by a set-screw Gr in the valve-casing, engaging with a rib e4; but if desired, this section, too, may have means for adjustment, such as a socketed rib e5 for an adjusting-screw, as indicated in Fig. 6.

The upper edge of the ring has two concentric countersinks e6 e7 at different levels. The upper edge es of the lower one ei is arranged to come exactly at the upper outer corner of the bevel c3 on the valve. The contiguous surface of the upper countersink is level, rounding up to the edge e9, which comes inside of the lower end of the neck b. The radial movement of the ring section or sections cnlarges or reduces a narrow luneshaped opening between the edge e8 and the bevel c3 and alters the capacity of the popchamber at the same time. This causes the valve to close at a different pressure after blowing. By the movement of the edge e9 inward or outward the annular outlet from the pop-chamber is varied in size, which causes the valve to blow off more or less strongly, as the case may be. It will be seen that as the ring-section has a sliding movement on its seat there is no tendency for it to stick, and, moreover, the screw enables it to be adjusted with the greatest nicety.

I-laving thus described my invention, what I claim is v l. The combination with a pop safety-valve and its casing, of a sectional ring forming the outer wall of the popchamber, and means for moving one or more of said sections rav dially.

2. The combination with a pop safety-valve and its casing, of a sectional ring forming the outer wall ot the pop-chamber, means for moving one of said sections radially, and

means forholding another-section immov# able.

3. The combination with a pop safety-valve and its casing, the latter having an annular well surrounding the valve-seat, of a sectional ring forming the outer Wall of the pop-chamber and seated on the bottom of said well, and means for moving one or more of the sections radially.

4. The combination with a pop safety-valve having the outer upper edge of the pop-chamber beveled, of a ring forming the outer wall of said chamber, having a countersink'with an upper edge lying in the plane of the upper corner of said beveled edge.

5. The combination with a pop safety-valve, of a ring forming the outer wall oli' the popchamber, said ring having two countersinks, the lower forming the pop-chamber and the upper the outlet from said chamber..

6. The combination with a pop safety-valve, of a ring forming the outer wall of the popchamber, said ring being made in sections, and provided with two countersinks, and means for moving one or more sections radi all-y. p

7. The combination with a pop safety-valve, of a ring forming the outer wall of the popchamber, said ring being lnade in halves, means for separating said halves, and means for retaining them in line.

S. The combination with a pop safety-val ve, of a ring forming the outer wall of the popchamber and made in halves, each provided with a rib at the meeting end, tangent pins iixed in one rib of each pair and passing freely through the other, and means for separating said halves of the ring.

9. The combination withapop safety-valve, of a ring forming the outer wall of the popchamber, said ring being made in halves, one or both of which has a socket, and a radiallyarranged screw having a head engaging with said socket.

In testimony whereof I aix my signature in presence of two witnesses.

JOSEPH M. COALE.

Witnesses:

D. H. EMoRY, J ASPER M. BERRY, J r. 

